Abstract
This study describes the production of hydrogen gas from sago industry wastewater under varying operating conditions, such as time of electrolysis, electrode surface area, and current intensity. The process was investigated by employing a four-factor three-level Box-Behnken statistical design (BBD). The results were examined using analysis of variance (ANOVA). This study developed a second-order polynomial model and utilized three-dimensional (3D) response graphs to study the interactive effect of process variables on the production of hydrogen gas. The optimum conditions for maximum hydrogen gas production were determined and found to be 45 cm(2) for electrode surface area, 22 min for time of electrolysis, and 13 A for current intensity. The predicted hydrogen gas output in optimum conditions was 1.12 mL/L. These results show that it is possible to achieve efficient hydrogen gas production, by electrochemically processing in sago industry wastewater.